A storm chaser photographer looks at thunderstorms supercells pass through areas in Vinson, Oklahoma
REFILE - CORRECTING CITY NAME A storm chaser photographer looks at thunderstorms supercells pass through areas in Vinson, Oklahoma late April 23, 2014. The thunder storms on Wednesday were a precursor of what's forecast for this coming weekend Saturday, Sunday, and Monday that could be the most significant multi-day tornado outbreak in the U.S. since 2011. Picture taken April 23, 2014. REUTERS/Gene Blevins (UNITED STATES - Tags: ENVIRONMENT SOCIETY)
People ride along a street during a dust storm in Hami
People ride along a street during a dust storm in Hami, Xinjiang Uygur Autonomous Region, April 23, 2014. According to Xinhua News Agency, strong winds and sandstorms lashed Xinjiang on Wednesday. Trains were postponed and roads were closed due to the winds. Picture taken April 23, 2014. REUTERS/China Daily (CHINA - Tags: ENVIRONMENT SOCIETY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
A woman works in the field during a dust storm in Hami
A woman works in the field during a dust storm in Hami, Xinjiang Uygur Autonomous Region, April 23, 2014. According to Xinhua News Agency, strong winds and sandstorms lashed Xinjiang on Wednesday. Trains were postponed and roads were closed due to the winds. Picture taken April 23, 2014. REUTERS/China Daily (CHINA - Tags: AGRICULTURE ENVIRONMENT SOCIETY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
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A person wearing a mask dodges during a dust storm in Hami
A person wearing a mask dodges during a dust storm in Hami, Xinjiang Uygur Autonomous Region, April 23, 2014. According to Xinhua News Agency, strong winds and sandstorms lashed Xinjiang on Wednesday. Trains were postponed and roads were closed due to the winds. Picture taken April 23, 2014. REUTERS/China Daily (CHINA - Tags: ENVIRONMENT SOCIETY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
A motorcyclist rides past a car during a dust storm in Hami
A motorcyclist rides past a car during a dust storm in Hami, Xinjiang Uygur Autonomous Region, April 23, 2014. According to Xinhua News Agency, strong winds and sandstorms lashed Xinjiang on Wednesday. Trains were postponed and roads were closed due to the winds. Picture taken April 23, 2014. REUTERS/China Daily (CHINA - Tags: ENVIRONMENT SOCIETY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
A large TVS (tornadic vortex signature) thunderstorm supercell passes over storm chaser Brad Mack in Graham, Texas
A large TVS (tornadic vortex signature) thunderstorm supercell passes over storm chaser Brad Mack in Graham, Texas late April 23, 2014. The thunder storms on Wednesday were a precursor of what's forecast for this coming weekend Saturday, Sunday, and Monday that could be the most significant multi-day tornado outbreak in the U.S. since 2011. Picture taken April 23, 2014. REUTERS/Gene Blevins (UNITED STATES - Tags: ENVIRONMENT SOCIETY TPX IMAGES OF THE DAY)
A storm chaser photographer looks at thunderstorms supercells pass through areas in Erick, Oklahoma
A storm chaser photographer looks at thunderstorms supercells pass through areas in Erick, Oklahoma late April 23, 2014. The thunder storms on Wednesday were a precursor of what's forecast for this coming weekend Saturday, Sunday, and Monday that could be the most significant multi-day tornado outbreak in the U.S. since 2011. Picture taken April 23, 2014. REUTERS/Gene Blevins (UNITED STATES - Tags: ENVIRONMENT SOCIETY)
Storm chaser photographer Brad Mack checks out the radar on his laptop as thunderstorms supercells pass through areas in Erick, Oklahoma
Storm chaser photographer Brad Mack checks out the radar on his laptop as thunderstorms supercells pass through areas in Erick, Oklahoma late April 23, 2014. The thunder storms on Wednesday were a precursor of what's forecast for this coming weekend Saturday, Sunday, and Monday that could be the most significant multi-day tornado outbreak in the U.S. since 2011. REUTERS/Gene Blevins (UNITED STATES - Tags: ENVIRONMENT SOCIETY)
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